The air temperature reached 31.4C shortly before 2pm.
One more day with temperatures above 28C and the island will have the three consecutive days where the maximum air temperature has exceeded 28C to qualify as a heatwave.
Jersey reached heatwave status today.
The Guernsey Met Office said that maximum temperatures on Wednesday are expected to reach 29C in Guernsey and 27C in Alderney.
The sunshine will persist through the day with a small chance of a thundery shower in the evening.
With temperatures exceeding 31C, many of the island’s youngsters spent the day on the beach and taking advantage of the water to cool off.
Otto Osborne, 12, was with his friends and family at the Bathing Pools.
‘It’s really hot so we’ll probably just come down here every day,’ he said.
‘It’s nice because it’s never too low to go swimming.’
He said that he also enjoyed the diving platform.
His dad, Lee Osborne, said it was a great location to bring children during half term.
‘It’s just a great facility, the combination of private and public makes it very well looked after,’ he said.
‘It’s a free facility, people can walk in from town, the bus terminus is walking distance, and the cafe is a charity.’
Round the coast, Peter Lloyd was at L’Ancresse with his grandchildren who are visiting from Hampshire.
‘We’re just taking things a bit slower than usual,’ he said.
‘We’ve drawn a bicycle in the sand which can hopefully be seen from the kiosk, because we’ve just bought them new bikes.
‘We’re also going to Herm and will be making the most of the beaches.’
Top temperatures over the bank holiday weekend reached 26.8C on Sunday and 30.8C on Monday.
The 30-year average is 13.6C.
The minimum temperature on overnight Monday was 22.2C.
From Thursday, temperatures are set to ‘feel more comfortable’ with daytime highs ranging from 22-25C and will be cooler at night.
‘As the high pressure that has been providing this unprecedented heat shifts slightly to the northeast, this will allow some slightly cooler air to move,’ said the Guernsey Met Office.
‘Winds with a more westerly direction will eventually bring cooler air from the Atlantic, and with this the chance of some mist or fog patches but still plenty of sunshine.
‘As is often the case with this building of heat through the day, there is a small chance of the odd shower bubbling up at times.’
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